IMO, type-in traffic for parked domains is a MYTH, cherished by domainers who want to attract as little attention as possible.
There may be users who type in a domain, but looking at my current filter list, I see that 34% of all filtered sites are associated with parking companies. As I am only getting the URLs from the preview tool, these sites must have been advertised at some point in time through Adsense.
Noone in their right mind would ever type in URLs like
Just to give a few examples.
Domainers, especially those in the second league, know that they probably can not live off type-in traffic, because their domain portfolio is still too small for generating enough traffic in total. Thus, they have to turn to other means of attracting traffic. Adsense seems to be the easiest way.
By littering our sites with their useless missleasing junk ads for utterly useless parked pages with ZERO content they are probably even worse than "word farms".